Fixed building `.mpy` files in both `build.yml` and `release.yml`.
To use in CircuitPython, simply install the [CircuitPython Community Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install circuitpython-ticstepper`.
Read the [docs](https://circuitpython-ticstepper.readthedocs.io/en/latest/) for info on how to use it.